(57) A rotor drive controlling unit and an image formation apparatus therewith are disclosed.
The rotor drive controlling unit includes
a motor,
a transfer device for transferring a rotational force of the motor,
a rotor connected to the transfer device and rotated with the rotational force of
the motor,
slits (13a through 13d), serving as elements-to-be-detected arranged on a periphery
centered on a rotation axle (12) of the rotor,
a detector (14) for detecting the slits,
a passage time detecting unit for detecting an interval between adjacent slits of
the slits passing the detector based on a signal generated by the detector,
an amplitude/phase generating unit for generating an amplitude and a phase of a rotation
period fluctuation about a desired period of the rotor based on the interval detected
by the passage time detecting unit,
a rotation controlling unit for controlling rotation of the motor based on the amplitude
and the phase generated by the amplitude/phase generating unit such that the rotation
period fluctuation is reduced, and
a control reference updating unit for updating the phase, at which updated phase a
rotation control of the motor is start, based on the phase generated by the amplitude/phase
generating unit with reference to the slit (13a) where the slits (13a through 13d)
have widths (γ1 through γ4, respectively), the widths γ1 through γ4 being mutually
different.
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